L

A service that provides higher-level custom communication
functions and relies on services provided by an underlying base
provider. In ISA, the Firewall client software is a layered service
provider that extends Winsock 2 from the client to the ISA server
and uses the underlying base TCP/IP service provider to communicate
to the ISA server.

LMHOSTS file

A text-based file that maps IP addresses to the friendly names
of Windows 2000 computers. This file is used as a static
routing table in Windows 2000 Server to authenticate and
register valid nodes in a local TCP/IP network.

load balancing

Load balancing distributes client requests among ISA Server
computers. If one ISA Server computer is unavailable, another
server can accept the request, preventing an interruption in
service.

Local
Address Table (LAT)

A table of all internal IP address pairs on the internal
network where ISA is installed. This list is used to control access
between clients on the internal network and remote IP addresses on
external IP networks (or the Internet). The LAT is registered and
stored in a text-based file within the installed directory for ISA.
This file is distributed to clients during setup and updated
periodically by ISA.